jspsmartupload问题(请教各位大大，特别是rinring大侠)：

我的环境是win2000,jdk1.3.1_02,tomcat4.0,数据库是SQL SERVER 2000，我设的FILEDATA为IMAGE类型来存储文件，可我用他的测试用例SAMPLE4.HTM，上传文件到数据库，可是不行，老是报 java.lang.NullPointerException 0 file(s) uploaded in the database. 他的代码我只该了一点点，就是连接数据库，和一个字段名。
<% // Variables
int count=0;
// Connect to the database
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();
Connection con = DriverManager.getConnection("jdbc:odbc:PTOP_OA","sa","");
// SQL Request
Statement stmt = con.createStatement(ResultSet.TYPE_FORWARD_ONLY ,ResultSet.CONCUR_UPDATABLE);
ResultSet rs = stmt.executeQuery("SELECT * FROM TFILES WHERE ID=1");
// if the resultset is not null
if (rs.next()){
rs.getstring("ID");
// Initialization
mySmartUpload.initialize(pageContext);
// Upload
mySmartUpload.upload();
// upload file in the DB if this file is not missing
if (!mySmartUpload.getFiles().getFile(0).isMissing()){
try { rs.updateString("FILENAME",mySmartUpload.getFiles().getFile(0).getFileName());
// Add the current file in the DB field
mySmartUpload.getFiles().getFile(0).fileToField(rs,"FILE_DATA");
// Update
rs.updateRow();
count++;
} catch(Exception e) {
out.println("An error occurs : " + e.toString());
}
}
}

// Display the number of files uploaded
out.println(count + " file(s) uploaded in the database.");
rs.close();
stmt.close();
con.close();
%>